1. Which quantity remains constant in an ideal transformer?
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Unit 19: Electromagnetism
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2. Electromagnetic induction was discovered by:
3. Electromagnetic induction occurs when:
4. Magnetic flux is measured in:
5. Which device converts electrical energy into mechanical energy?
6. The working principle of electric generator is:
7. An electromagnet becomes stronger when:
8. The unit of magnetic field strength is:
9. The direction of magnetic field around a current carrying straight wire is given by:
10. The angle made by Earth’s magnetic field with the horizontal is called:
11. The main principle of an electric motor is:
12. An electron beam can be deflected by:
13. A transformer works only with:
14. A current carrying coil placed in a magnetic field experiences:
15. Which device uses the magnetic effect of current?
16. The angle between geographic meridian and magnetic meridian is called:
17. The magnetic field of Earth is similar to that of:
18. The rule used to find direction of force on a conductor is:
19. The split ring in a DC motor is also called:
20. The core of a transformer is made of soft iron to: